Process and means for cutting



J. T. AND P. P. MURPHY. PROCESS AND MEANS FUR `CUTTING. APPLICATION HLED rEB.la,1919.

RENEWED APR. 1,1920.

Patented J une 15, 1920.

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o u o o o o o UNITED STATES PATENT VOFFICE.`

JOI-IN MURPHY AND PATRICK P, MURPHY, 0F CHICOPEE FALLS, MASSACHUSETTS.

PROCESS AND MEANS FOR CUTTING.

Specification of Letters Patent.

Patented June 15, 1920.

Application filed February 13, 1919, Serial No. 276,769. Renewed .April 1, 1920.- YSerial No. 370,537.

Ia'nd State of Massachusetts, have invented certain new and useful Improvements in Processes and Means for Cutting, of which 'the following is a full, clear, and eXact de- Isfription.

This invention relates to a process and means for cutting or blanking metal for saw blades.

One of the objects of the invention is to provide a process and means for simultaneously producing a large number of blanks without waste of metal and without deformation of the blanks.

The process and means are especiallyden :signed for the production of blanks for the manufacture of saw blades, and permits of the production of a large number of blanks for saw blades from a sheet of steel or other metal without the waste of a particle of metal and in such manner that the blades lare of uniform width and devoid of high fspots or similar defects.

With the above and other objects in view the invention relates to certain steps, combinations, construction and arrangements of parts clearly described in the following specication and fully illustrated in the accompanying drawings, in which Figure 1 is a side elevation of a set of dies shown with a sheet of steel therebetween in position for blanking the sheet into a plurality of blanks for saw blades.

Fig. 2 is a longitudinal sectional view showing the manner in which the die is constructed and the way in which the blanks are displaced after the sheet is cut.

Fig. 3 is a plan view of one of the blanks for the manufacture of a saw blade.

Fig. 4 is a plan view of one of the dies.

Referring to the accompanying drawings 5 designates the body or frame of the lower die member and 6 the body or frame of the upper die member. The lower die member is equipped with four posts 7 which are driven into openings 7*L located in the four corners thereof. The upper die member 6 is provided with four openings 8 adapted to slidably receive the posts 7. The die frame Gis reciprocated by suitable operating means clamped thereto and is held in correct aline ment with the die frame 5 by means of the posts 7. The engagement of the frame 6 with the post 7 is lubricated by means of a spiral groove 7b formed in said post 7.

The lower die frame 5 is formed with relatively large rectangular pocket 9 which includes abase wall 9d side walls 9b, and end walls 9c which are disposed in perpendicular relation to each other. The upper die member is similarly constructed and the pockets of the two die members or frames are of eX- actly equal area and proportions.

On the wall 9a a series of rectangular cutting elements are disposed, which consist of heat treated steel blocks 10 each one of which is provided with sharp corner portions 10"t and a flat top 10b. The cutting elements 10 are spaced from each other by spacing blocks 11 which are of exactly equal width to the blocks 10. The blocks 11 are considerably narrower than the blocks 10V whereby said blocks 1() will project above the blocks 1l and rectangular die pockets or spaces 12 will be formed between the opposing sides of the blocks 10.

The blocks 10 are fastened in place to the frame 5 by means of screws 13 and dowel pins 1,41. The screws 13 extend through the wall 9a and through the base of the block l0 through the major portion of the body thereof, but do not extend through the top of the block. The blocks 11 are secured in place by screws 15 which may extend through the top thereof.

A similar set of cutting blocks and spacing blocks are connected in a similar manner Vto the upper die frame members 6, but the blocks 10 of the upper die frame are ar ranged to enter the pockets 12 provided in the lower die assemblage while the blocks 11 of the upper die assemblage provide spaces 16 to receive the blocks 10 of the lower die assemblage. It will be seen, therefore, that the upper blocks 10 are arranged in staggered relation to the lower blocks 10 and in alinement with the spacing blocks 11 of the lower die frame, while the cutting blocks 10 of the lower die frame are arranged in alinement with the spacing blocks 11 of the upper die frame. The cutting blocks 10 of the lower die frame have an accurate it in the spaces between the cutting blocks 10 of the upper die frame.

In the spaces 12 of the lower die assemblage a series of stripper bars 17 are arranged. The stripper bars 17 are connected with the screws 18 which slide through the Vso.,

Wall 9a of the frame 5 and are provided with heads 18a Which are adapted toabut against ythe'shoulders18h formed inV said Wall 9a.:

Springs 19 are arranged around thescrews 5 or guide rods 18 and are adapted to keep said stripper bars 17 iiush with the upper surfaces of the blocks 10. stripper bars is archangedy in asimilar ner in the spaces 16 vet' the upper die traine. l 'lllieispacingfbiecks 11l are considerably shorter than the' cutting blocks; 1G, and three of such; spacingY blocks are Aused-between the sidesfot eaclifpairbt cutting blocks, two spacing'- blocksbeing locatedattheends of i :thecutting blocks and-iene intlie'center ot @easily `betWeenithe; blocksV 10, so' that :they v will not bind-against the sides thereof yEach die .trame is fshownfto be equipped -ivith a 3Q `ilation to `-thefdie press. f

Our improved cutting and blankingpmc- -1 ess is .earriedeut with .the teregeing' equip- 7.In'ent, though, it is apparent that' slight structural changes freight beemployed f andv the v process t realized with a .-dief-iassemblage thus modiiied.

lower set fot die blocks ltlfand pressure lfappli'ed to cause the opposingends.:otfsaid A ,blocks to lcut through; the metalend enterV lthe spaces fbetween themselves, as shown in 2. Thearea of the end-.aces otfthe` die n the areas ottheispacesbetween?the blocksV Y ...reach other then stripper-,bars will'. torce` the f 10... When the :diei'rames .are separatedrtroni blanks out Jotthespaees -12wandf16f rinto yline with) the-,end acesi of the lower-.set oii-cut- .loweri'dieif-rame. Y

fIni the initialwmovementgf as shown in Fig.

lthe rawstock.ori.sheetisnsubjected to a pressure: operation which. tends 'to Vcorrect any slight surface deformations:Whichnia exist :inthe stock.- on sheet. Whenithe sheet l or. stock .is Ythus .sheared vkinte .the Ablanks the r )ortionsWhichwforrnthe blanks iare again i Ci A similar set of' i ianmaintains the metal or material against any tendency to Warp or distort. VVhenjthe cutting blocks are Jforced by the continued pressure throuohthe metal or other material eing Worked a uniform cutting action is niaintained over and on the material or metal'. it is impossible tor the die'Y parts, or the cutting edges oi tlie'dieblocks lOtoyield in the slightest7 and as there is no space betweenV the engaged surfaces of the Adieblocks 10 it is impossible for metal'er'the material to bur' oil betiveenithe intertitting` die blocks. Thel result is that the"finished` blank is formed Withiclean'snooth 'edges dis there `is no slidino action oi the die blocks against trarne,V cutting 'blocks l"secured to!i 4 the :die paire ot biturcated flugs 20a-,on each-fend, whereby it fmaynbefclarnpedi fin. operative reframe, spacing blocks secured between nthe cutting lblocks Aand adapted to maintain' said cutting fblocks in true paralleli relation With each-other1andra-provide: lateral supports thereto@- Y seeenddie vtrarne;` ar second' set ofV cutting blocks.` arrangede ons saidfisecond die traine;` -and=fspacing ffblocksff'seeured bek s g :tt/veen the;seconolfset offcuttingffblocks andi .In .-blanking, the metalV sheet S5 lshown in ljlig." Lais-.placed bet-WeenV the. upper-.hand

f otherfthe cutting Yblocks ofthe-second set having close iitfbetween theciittingfblocks I of the first set.

. 2. lli-process of making blanks for Vhack saw vbladesconsisting in'subjecting avsheet having a iv-i'dthequalt'o-thedengthmffthe Vibladeste bemande-'toa' cuttingI action between a series 'otfdie's presenting tofthe sheet a'suriace area equal to thatV` ofr the l sheetand `of a lengthequal to'that of'vtheindividual lbla'nktobe formedfand otavvidth equal to that ofY saidffblank said: dies-fbeing arranged A inffopposing setsfand thefrnernbersboffeach set .ting blocksV 10,- When .the lmachine operator y ,may collect .all the :blanks-thus. :madeby a a Y. singlehandimovement acrossthejfaceof the 2 beings rigidly spaced-.from feaclrfother to ,f snugly receivethe :members of the-ether set, and. operating .said f {die #sets y:to-camsex the members vthereoffto simultaneouslyengage blanksl offequal Width and avlength--equal to the-Width ofthe sheet.-

3. A (mechanisrnfor;11Inanufafcuringl hack sauT blade blanks.e'onsistiingf.-ofepposingdie retainingframes', a serieslo.die-blocks se- -euredto..one oty said iframes` and-:having a width equal to that of the hack saw blades to be formed and length equal to that of the hack saw blades to be formed, blocks for spacing said die blocks from each other and having a width and length equal to that of the die blocks, a similar set of dies and die blocks arranged on the other die frame so that the spaces between the second set of die blocks will receive the first named die blocks and the second named die blocks will lit in the spaces between the first named die blocks, yielding stripper plates movable between the respective die blocks and means for guiding the movement of the frames toward each other.

4L. The process of making blanks for hack saw blades consisting in subjecting a sheet of hardened and tempered steel from which the blanks are to be formed to a cutting action between a series of dies having a total transverse area equal to the width of the sheet, said dies being arranged in opposing sets and the members of each set being rigidly spaced from each other to snugly receive the members of the other set1 and operating said die sets to cause the members thereof to simultaneously engage the opposite faces of the sheet and sever said sheet into a plurality of strips equal to the widths of the blanks desired.

5. A mechanism for manufacturing hack saw blade blanks consisting of opposing die retaining frames, a series of die blocks secured to one of said frames and having a width equal to that of the hack saw blade to be formed7 spacing blocks having a width equal to that of the die blocks arranged alternately between the die blocks and with their outer faces located in a different plane than the working faces of the die blocks, a similar set of dies and die blocks similarly arranged on the other die frame so that the spaces between the second set of die blocks will receive the first named die blocks and the second named die blocks will fit in the spaces between the first named die blocks, yielding stripper plates movable between the respective die blocks, and means for guiding the movement of the frames toward each other.

Signed by us at Springfield, Massachusetts. ,n

JOHN T. MURPHY. PATRICK P. MURPHY. 

